This SAE Aerospace Standard (AS) defines the requirements for a convoluted polytetrafluoroethylene (PTFE) lined@ metallic reinforced@ hose assembly suitable for use in aircraft fluid systems at temperatures of -65 to 400 ??and at operating pressures Types Hose assemblies furnished under this document may be of two types: Type I - Non-conductive Inner Tube Type II - Conductive Inner Tube Hose assemblies furnished under this document may be of the following classes. If no class is defined then Class 1 shall prevail. Class 1 - Liquid Proof Test Class 2 - Liquid and Pneumatic Proof Test